major boosting issues
09 June 2010, 07:55 PM
#1
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major boosting issues
car went **** up a few weeks ago, lost power then a few minutes later developed a misfire, got the car into work last week and set about sorting it.
checked the obvious and eventually found a dead coilpack, while it was all apart we changed the cambelt and tensioners as the old belt was looking tired and we couldnt quite get the marks to line up with it.
got the new belt on and finished last night and the car started spot on running smoother and queiter than ever.
now here's the problem the exhaust is VERY quiet and the turbo will not produce any boost?? no undue noises when driving and do get small amounts of wastegate chatter when approaching zero on the guage.
swapped the solenoid, tried another turbo, took the exhaust off to see if its clear, checked all hoses even run the actuator pipe direct from the turbo and still nothing. done a compression check and got over 150 on all four cylinders. As said the engine runs lovely just very slow..it doesnt pick up very well through the rev range and just sounds off when i try to push it to make any boost.
i'm lost for things to try now.
checked the obvious and eventually found a dead coilpack, while it was all apart we changed the cambelt and tensioners as the old belt was looking tired and we couldnt quite get the marks to line up with it.
got the new belt on and finished last night and the car started spot on running smoother and queiter than ever.
now here's the problem the exhaust is VERY quiet and the turbo will not produce any boost?? no undue noises when driving and do get small amounts of wastegate chatter when approaching zero on the guage.
swapped the solenoid, tried another turbo, took the exhaust off to see if its clear, checked all hoses even run the actuator pipe direct from the turbo and still nothing. done a compression check and got over 150 on all four cylinders. As said the engine runs lovely just very slow..it doesnt pick up very well through the rev range and just sounds off when i try to push it to make any boost.
i'm lost for things to try now.
10 June 2010, 01:05 AM
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header leak, boost leak (intercooler pipe, vac hose, dump valve, intercooler split), wastegate stuck open, actuator fubar...
usual step though..
Simon
usual step though..
Simon
10 June 2010, 01:18 AM
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good point,. if you can hear flutter as the boost gauge reaches 0 (you have checked the boost gauge is correct?) then it is possible the turbo is producing the boost and is overspeeding trying to produce more due to a boost leak somewhere.
Simon
Simon
10 June 2010, 09:04 AM
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there's no dumpvalve on the car, all pipes have been checked, actuator and wastegate are fine (on both turbo's) there's no noise from a boost leak and cant hear the turbo spool up and the exhaust is like silent runnings now compared to how it was, it all points to a dead turbo but it isnt???
10 June 2010, 09:41 AM
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we pretty much stripped and checked the whole system, everything looks and feels ok, the car drives fine just cant see why it wont make any boost
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19 June 2010, 07:03 PM
#9
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cars not got a cat and its a 3" system turbo back, we've had the exhaust off and its clear, changed the maf and tried a stock ecu and still no difference, if i drive at very light throttle it pulls ok and seems to get 2-3 psi boost but as soon as i open the throttle the engine note changes and boost drops off and the engine really struggles to rev at all, it drives well upto 3.5k and nothing afterwards
21 June 2010, 01:06 AM
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21 June 2010, 02:18 AM
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did u leave engine in car to do cam belt?? Obviously as a observation if it was boosting before but not now you have disturbed a boost pipe. but by the sounds you have taken all parts of.. check pipe to boost gauge??
21 June 2010, 10:26 PM
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the car lost power very suddenly before the belt was done, i am getting a little bit of boost in lower gears 2-3 psi at light throttle but the engine sounds so flat and struggles to rev freely past 4k especially in 5th, bearing in mind how loud my car normally is, at motorway speed now its like the car it switched off its that quiet now. the cel is still showing no codes and i'm still checking everything over and over with no joy as to finding whats wrong
21 June 2010, 10:30 PM
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are there any other engine sensors that might kill boost if they're not working?
21 June 2010, 10:50 PM
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yep perfectly now the coil pack has been changed, done a compression check and got good even pressure all round
Last edited by incarsolutions; 21 June 2010 at 10:53 PM.
21 June 2010, 11:30 PM
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I’m assuming you didn’t test the car after replacing the coil pack to see if that actually fixed the first problem? It’s possible that replacing the cam belt has in fact introduced another as it sounds as if your timing may be running retarded.
22 June 2010, 12:33 PM
#23
May sound silly and obvious....but have you checked the spark plugs?
Its cant be a sensor as otherwise the ECU would have thrown a CEL by now....so its back to basics again....what ecu is your car running?
Have you made any further checks on this?
Its cant be a sensor as otherwise the ECU would have thrown a CEL by now....so its back to basics again....what ecu is your car running?
Have you made any further checks on this?
22 June 2010, 07:48 PM
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That depends on how much thought you give to this. Given the OP had the issue after replacing the belt and not before and has also tried all the above and more, its worth a look. If it's ok, move on 
22 June 2010, 08:23 PM
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All fixed, after taking it off again and re checking it turns out the second silencer on the exhaust had completely destroyed itself, removed all the debris and the car is back on song (just really really loud) annoying really as i'd already checked the exhaust and it looked fine but after a few days of driving it seemed to push all the blockage to the back. just need a quieter exhaust now.
22 June 2010, 10:31 PM
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Simon
23 June 2010, 03:05 PM
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Simon, i didnt take offence nor do i, you must have mistaken the for a 
. Here's some love instead 
Pleased the OP is back on track.
Neil
for a . Here's some love instead Pleased the OP is back on track.
Neil
25 June 2010, 08:24 PM
#29
...with four cams any jump of a tooth or more anywhere (although they usually jump on the crank) will show in a compression test.. usually the compression drop from this is obvious on idle and cruise and on boost it is fine because it is only on one bank is drops..